text: The Forest of Dean and nearby areas were an ancient source of iron ore and charcoal. There is evidence of early mining and smelting, and there were many sites consisting of groups of forges. The site of Ariconium was on the rise of a hill, where airflow is increased due to the terrain. This favoured the establishment of bloomeries, an ancient process that produced imperfect iron, together with cinders, dirt, and unreduced oxide. A Roman contribution was the use of bellows, causing an air blast that was hotter and produced better but unforgeable iron, requiring a further refining by reheating, and using a great deal of charcoal. The cinder refuse or scoriae was dumped in great piles at such sites.